Mercury 9.8HP Short Tiller – 2S (M17003)
Mercury 9.8HP Short Tiller – 2-Stroke outboard motor is a compact and reliable engine, perfect for small boats and light watercraft. Known for its portability, simplicity, and responsive performance, this motor is ideal for fishing, utility, or recreational use. Below is a detailed description:
General Information
- Brand: Mercury
- Horsepower: 9.8 HP
- Engine Type: 2-Stroke
- Control Type: Tiller Handle
- Shaft Length: Short (15 inches)
- Fuel Delivery: Carbureted
Key Features
- Compact and Lightweight Design: Weighing approximately 65–75 pounds, making it easy to carry, install, and store.
- Tiller Handle Control: Simplifies steering with integrated throttle and gearshift for precise handling.
- Manual Start: Reliable pull-start system ensures easy operation in all conditions.
- Shallow Water Drive: Great for navigating rivers, creeks, or shallow bays.
- Durable Build: Corrosion-resistant materials make it suitable for both freshwater and saltwater use.
Fuel and Oil
- Fuel Type: Unleaded gasoline (87 octane or higher).
- Oil Mix Ratio: 50:1 gasoline-to-oil ratio (use TC-W3 certified 2-stroke oil).
- Fuel Tank: External tank with a capacity of 3–6 gallons, depending on the setup.
Performance and Applications
Speed Potential: Capable of pushing lightweight boats up to 10–15 mph, depending on the load and conditions.
Best Uses:
- Small fishing boats
- Inflatable dinghies
- Tenders or utility boats
Maintenance Tips
1. Fuel System Maintenance
- Inspect the fuel lines and primer bulb for wear or leaks regularly.
- Clean or replace the fuel filter annually.
- Use a fuel stabilizer to prevent varnish or gum buildup during storage.
2. Spark Plug Replacement
- Recommended Spark Plug: NGK BP7HS or equivalent.
- Replace the spark plug every season or 100 hours of use. Ensure the gap is set to 0.030 inches.
3. Water Pump Impeller Maintenance
- Replace the impeller every 2–3 years or if you notice reduced water flow.
- Flush the cooling system with fresh water after saltwater use to prevent corrosion.
4. Gearcase Oil Change
- Change the lower unit oil annually. Look for signs of water intrusion (milky oil) and replace the seals if necessary.
5. Carburetor Cleaning
- Clean the carburetor if the engine exhibits rough idling or power loss. Use a rebuild kit as needed.
Common Issues and Troubleshooting
Starting Problems
- Cause: Old fuel, clogged carburetor, or weak spark.
Solution:
- Drain stale fuel and clean the carburetor.
- Replace spark plugs and inspect the ignition system.
Overheating
- Cause: Impeller wear or debris in the water intake.
- Solution: Replace the impeller and clean the intake screens.
Loss of Power
- Cause: Fouled spark plug, dirty carburetor, or damaged propeller.
Solution:
- Replace spark plugs, clean the carburetor, and inspect the prop for damage.
Parts and Accessories
OEM Parts
- Mercury Dealers: Authorized dealers offer genuine parts and support.
- Online Retailers:
Aftermarket Parts
- Sierra Marine: Trusted aftermarket parts for impellers, filters, and ignition components.
- Mallory Marine: Offers high-quality replacement parts for carburetors and ignition systems.
Used Parts
- eBay: Look for “Mercury 9.8HP 2-stroke parts” for used or reconditioned components.
- Local Marine Salvage Yards: Excellent for hard-to-find or discontinued parts.
Performance Enhancements
Propeller Upgrade:
- Aluminum props are standard, but stainless steel props offer greater durability and performance.
- Select the right pitch for your specific boat and load.
Fuel Efficiency Tips:
- Use ethanol-free gasoline to minimize carburetor issues.
- Add a fuel stabilizer like Sta-Bil for long-term storage.
Engine Tune-Up:
- Regularly decarbonize the engine to maintain optimal performance and extend its lifespan.
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